Disk-grinder.



No. 862,724. PATENTED AUG. 6, 1907. R. V. FIELDS.

DISK GRINDER.

APPLIOATIOYN FILED MAY29,1906.

2 SHEETS-SHEET l.

@Vi/@ddl atto'omuj No. 862,724. PATENTED AUG. 6, 1907.

' R V FIELDS DISK GRINDER.

APPLIOATION FILED Mu 29,1906.

2 SHEETS-SHEET 2.

ua a n z m v nu UNITED STATES PATENT OFFICE.

DISK-GRINDER.

no.v 862,724.

Specicaton of Letters Patent.

Patented Aug. 6, 1907.

Application filed May 29, 1906. Serial lilo. 319,403.

To all whom it 'may concern:

Be it known that I, ROBERT V. FIELDS, a citizen of the United States,residing at Douglass, in' the county of Butler and State o f Kansas,have invented new and useful Improvements in Disk-Grinders, of which thefollowing is a specification. A

This invention relates to' grinding machines, the object of theinvention being to provide a machine especially adapted for grindingdisks such as are used on harrows, plows andthe like, the machineembodying means whereby disks may be rapidly ground' and put incondition for use, the disk being revolved at any desired speed 'so asto feed the edge thereof to the grinding wheel of the machine, whichgrinding wheel is rotated at a high rate of speed.

A further object of the invention is to provide means whereby thedisk-carrying arbor or shaft may be adjusted relatively to the arborofthe grinding wheel, thereby adapting the machine to disks of differentsizes. I

Another object of the invention is to provide means for supporting thedisk adjacent to the periphery thereof, whereby the edge of the disk isheld in grinding Contact with the grinding wheel and allowance isautomatically made. for disks whose edges or peripheries are out oftrue.

The machine also embodies means whereby the shaft which carries thegrinding disk may be thrown out of operation without the necessity ofstopping the'arbor of the grinding wheel. l

With the above and other objects in view, the nature of which will morefully appear as the description proceeds, the invention consists in thenovel construction, combination and arrangement of parts hereinaftermore fully described, illustrated and claimed.

In the accompanying drawings, Figure l is a perspective view 'of adisk-grinding machine embodying this invention. Fig, 2 is a sideelevation of the same partly in section. Fig. 3 is an elevation of themachine. Fig. 4 is a longitudinal sectional view of the extensible bracefor the disk-carrying shaft. Fig. 5 is a perspective view of thestationary member of said extensible brace. Fig. 6 is a similar view ofthe movable section of the brace. I

Referring to the drawings, 1 designates a standhavingits upper endforked as shown at 2 and provided with bearings for the arbor 3, onwhich the grinding disk or disks 4 are mounted, said arbor also beingprovided with a band wheel 5 adapted to receive a belt from any suitablesource of power andiwhereby the arbor of the grinding wheel or wheelsmay be driven at any desired rate of speed, the grinding machine thusfar described being of the ordinary conventional type.

In carrying out the present invention, 1 employ a supporting base 6provided with bearings 7 for a shaft 8 which is provided with a bandwheel 9 adapted to receive a driving vbelt from any source of power, andif desired, the same source-of power as that `from which having a collar14 which embraces the shaft 12 outside ofthe wheel 11, and anothercollar-'15'L which embraces the shaft 8, as best shown in Fig. 1. 'Eheinner or lower end of the shaft 12 is mounted in a bearingcarried by aT-shaped sleeve 15 mounted on the shaft 8, as

.shown, and the wheel-l0 is adapted to be moved into,"

and out,of engagement with the wheel 1l by means of a shipping lever 16fulcruined on the base frame 6 and having a forked engagement with thehub of said wheel 10, as clearly shown in Fig. 1. In this way,

the'shaft 12 may be thrown into and out of operation' l by simplyshifting the lever 16 in the proper direction. ,The construction justhereinabove described ensol ables the shaft l2 to beswung toward andaway from the grinding wheel uponthe shaft 8 as a center for the purposeAof moving the disk into and out of contact with the grinding wheel. Inorder to provide for thus adjusting or moving the shaft 12, the stand 1is provided with a projecting guide 17 upon which is mounted a runner orslide 18 connected by means of a link 19 to a sleeve 2O which embracesthe shaft l2.

Mounted on a bracket arm' 21 connected rigidly with the strand 1 is ashifting lever 22 provided with a thumb latch 23 which engages a racksegment 24 carried by the arm 21. A link 25 is pivotallyinterposed'between the lever 22 and the slide or runner 18, so that byswinging the lever. 22, the slide 18 may be moved lengthwise of the arm17, and through the medium of the'con'necting link 1 9, the shaft 12 isswung on the shaft 8 as a center so as to carrythe free end of saidshaft 12 toward and away from the grinding wheel 4.

Adjustably mounted lay-means of a threaded connection on the shaft 12 isa step 26 in the form of a nut having a reduced and squared shoulderportion of the same size as the squared central opening in the ordiynary disk 27 used on plows, cultivators and the like. The step 26 isshown in the form of a nut, and when properly adjusted on the shaft l2to-set the disk 27 in proper relation to the grinding wheel, theadjustment of said step or nut may be fixed and maintained by means ofajam-nut 28. The disk is held in place by means of a coiled Aspring 29which is slipped over the upper end of a shaft12 and retained in placeby means of a nut 30. This enables a disk-to be' readily placed on theshaft 12 and removed therefrom and when seated on the step 26, the diskis caused to revolve with the shaft 12, as the latter is driven by themechanism hereinabove described.

In order to brace the shaft 12 at a point remote from los its point ofconnection with the shaft 8, I employ prising an inner stationary member3l shown inthe form of an eye beam which is connected at one end to i abracket-arm 32 shown as -forming an extension of the Y guide 17. Theouter or sliding member of the bracek which is shown in Fig. 6,comprises the parallel portions 33 which embrace the web portion of thechannel iron member 3l so as to slide back and forth on the member 31,the parallel portions 33 being longitudinally sl0tted, as shown at 34,to receive a bolt or rivet 35 which passes also' through the member 3l,holding the two members together but permitting a relative longitudinalsliding movement of the same.

The projecting end portion oi the member 33 is provided with a collar 36which embraces the shaft 12 as shown in Fig. l, and if desired, saidcollar 36 may be extended inr the form of an elongated sleeve 37 to give`a longerilbeari'ngon the shaft 12 for ,the purpose of A steadyingthelatter close up tothe step on which the i. disk is mounted.

, In order to support the disk adjacent to its periphery and near thegrinding point, I provide one or more supporting guide rollers 37, eachof which is journaled on the upper end of a stem 38 slidingly mounted ina socket 39 carried by the stationary memberl ofthe extensibletelescopic brace. Each of the rollers 37 is held in contact with theconcaved' side of the disk by means of a coiled spring 40 whichencircles the stem 38. Two of such rollers37 are preferably employed tosustain the peripheral portion of the disk in operative contact with thegrinding wheel.

The grinding wheel 4 is ordinarily driven at a very high rate of speed,While the shaftl2 which carries the disk is rotated at a comparativelyslow rate of speed, say two hundred revolutions per minute', and in thisway the periphery of the disk is fed across the periphery of thegrinding wheel and-the edge of the disk quickly ground true. Thesupporting guide rollers 37 are particularly useful when the machine isoper- -two witnesses.

a l ating on disks which have been bent out of true, it being necessaryin each case to provide a special support for the untrue edge of thedisk; asit moves in contact with the grinding wheel. l

In operation, the shaft 12 is rocked in a direction away trom thegrinding wheel by meanso the` lever 22. A disk is then placed on theshat inengagement with the step thereof and the spring 29 and nut 30applied. The lever 16 is then moved to throw the shaft driving mechanisminto operation and afterwards the lever 22 is adjusted to move the shaftl2 toward the grinding wheel 4, thus moving the disk into grindingengagement with said wheel. As soon as the disk is properly ground, theshaft 12 is moved away from the grinding wheel by means ofthe lever 22and then the shaft l2 is stopped by shifting the lever 16 in the properdirection. The disk is then removed from the shaft in readiness forlanother disk.

I claim: 1. A disk grinding machine embodying a'stand, a rtary arborthereon, a grinding wheel on said arbor,4 a disk carryi'ng shaft, meansfor driving said shaft, permitting one endpf said shaft to move towardand away from the grinding wheel, an extensible brace interposed-between' the stand and said disk carrying shaft, and 'a lever and rackmoiinted on an arm extending from the stand for holding said brace inadjusted position, substantially asdescribed.

2. A disk grinding machine embodying a stand, a rotary arbor thereon, agrinding wheel on saidarborLardisk car ryng shaft,' means for drivingIsaid shaft and permitting one end of the shaft to be moved toward andaway from the'grindingwheel dui-ing its operation, means for holding adisk onsaid shaft, means for` shifting said shaft toward and away fromthe grinding wheel,- and'spring mounted rollers disposed under the diskatA opposite sides of said shaft, foi` yieldingly sustaining the edgeofthe disk .'in

' operative contact with the grinding wheel, said rollers being eachmounted on a stem, and said stems being slldingly mounted in socketscarried by a stationary member of an extensible telescopic brace.

In testimony whereof, I afiix my signature in presence of ROBERT-V.FIELDS.

Witnesses:

Wrnnmrr W. Cmnk, Omvs M. WAnnnNnnn.

